I have a large wide area network currently consisting mostly of frame 
relay links over Cisco equipment. We're slowly replacing each frame link 
with a VPN, using NetBSD 1.6.1 as routers. I've got GIF tunnels between 
each link, using IPSec transport encryption. Do I need to set up mrouted 
tunnels to route multicast packets across this network, or will the gif 
tunnels automatically pass multicast info?

Let's take a step backwards - assume that I know next to nothing about 
multicast (almost true), but I need multicast routing due to Novell & 
others (regrettably true). How would I set it up, given a NetBSD-based 
router at each location, ex0 (public), ex1 (private, NATed), and gifX 
(VPNs to various branches) interfaces? Obviously, I don't need to worry 
about ex0, since it's the public address, and I only want multicast 
packets forwarded over my private network.

Any pointers would be helpful.